This error is useful because it tells the author which transformer experienced the failure.

Mixed Mode

In terminate mode, a rejected feature will not cause the translation to stop, provided that the <Rejected> port is connected to a further object:

In short, an author can create a mixed mode, where some transformers stop the translation on rejecting a feature (the Intersector above), but others will handle the feature another way (the Bufferer). That way the author can try to handle rejected features that are expected, but stop the translation if there are truly unexpected failures.

Feature Counts and Inspection

In continue mode, features that exit a <Rejected> port are counted and saved for inspection:

Features will be saved for inspection even if there is no Logger or other transformer attached. The number tells us how many features were rejected and the green icon can be clicked to inspect the data.